For what it's worth, here are my thoughts on the subject. I have a narrow (just wide enough for two vehicles with a tiny amount to spare) country lane near to me, which I drive down regularly. It has a 40mph speed limit and a solid white line painted on the nearside in both directions. Quite regularly, an oncoming vehicle will straddle the middle white line and encroach on my side of the road. This tends to either be a larger vehicle, a Transit van say, or a car being driven by someone who thinks it is twice as wide as it actually is! Because of this, I tend to drive with my nearside wheel on, or slightly over, the nearside white line. This, as I see it, presents two possible points of danger; I may scrape the tip of my nearside wing mirror on the hedgerow, or I may have a head on accident with a van coming the other way at 40mph. If I don't turn off the RDMS, for some reason best known to itself, the system thinks the head on accident with the forthcoming Transit van is the better option and tries to drag me over into its path.
As far as I am concerned, the system is not only useless but downright dangerous. It is not, by any means, fit for purpose. The ability to turn it off permanently should be the absolute minimum requirement, imho...